<?php
class RSA
{
/**
* RSA签名
* @param $data 待签名数据
* @param $private_key 私钥字符串
* return 签名结果
*/
function rsaSign($data, $private_key,$type = 'RSA') {

$search = [
"-----BEGIN RSA PRIVATE KEY-----",
"-----END RSA PRIVATE KEY-----",
"\n",
"\r",
"\r\n"
];

$private_key=str_replace($search,"",$private_key);
$private_key=$search[0] . PHP_EOL . wordwrap($private_key, 64, "\n", true) . PHP_EOL . $search[1];
$res=openssl_get_privatekey($private_key);

if($res)
{
if($type == 'RSA'){
openssl_sign($data, $sign,$res);
}elseif($type == 'RSA2'){
//OPENSSL_ALGO_SHA256
openssl_sign($data, $sign,$res,OPENSSL_ALGO_SHA256);
}
openssl_free_key($res);
}else {
exit("私钥格式有误");
}
$sign = base64_encode($sign);
return $sign;
}

/**
* RSA验签
* @param $data 待签名数据
* @param $public_key 公钥字符串
* @param $sign 要校对的的签名结果
* return 验证结果
*/
function rsaCheck($data, $public_key, $sign,$type = 'RSA')  {
$search = [
"-----BEGIN PUBLIC KEY-----",
"-----END PUBLIC KEY-----",
"\n",
"\r",
"\r\n"
];
$public_key=str_replace($search,"",$public_key);
$public_key=$search[0] . PHP_EOL . wordwrap($public_key, 64, "\n", true) . PHP_EOL . $search[1];
$res=openssl_get_publickey($public_key);
if($res)
{
if($type == 'RSA'){
$result = (bool)openssl_verify($data, base64_decode($sign), $res);
}elseif($type == 'RSA2'){
$result = (bool)openssl_verify($data, base64_decode($sign), $res,OPENSSL_ALGO_SHA256);
}
openssl_free_key($res);
}else{
exit("公钥格式有误!");
}
return $result;
}

}